April 3rd, 2014, 05:48 PM  #1 
Newbie Joined: Apr 2014 From: Auckland Posts: 3 Thanks: 0  Functions
If F(x)=2x+2 Simplify when a. f(x) and b. f(x^2) Im just unsure if i should be substituting in a 'x' in to the equation or i have to multiply the whole equation against the negative sign. Same goes for f(x^2). Can someone please push me in the right direction? Many thanks! 
April 3rd, 2014, 07:44 PM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,100 Thanks: 1905 
I take it you meant f(x) rather than F(x). (a). f(x) = 2(x) + 2 = 2x + 2 (b). f(xÂ²) = 2(xÂ²) + 2 = 2xÂ² + 2 
April 4th, 2014, 03:19 AM  #3 
Senior Member Joined: Mar 2014 Posts: 112 Thanks: 8 
$\displaystyle f(x)\,=\,2x\,+\,2$ $\displaystyle f(x^2)\,=\,2x^2\,+\,2$ 

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